Anoxic Event
Oceanic anoxic events or anoxic events occur when the Earth's oceans become completely depleted of oxygen (O2) below the surface levels. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past. Anoxic events may have caused mass extinctions. These mass extinctions were so characteristic, they include some that geobiologists use as time markers in biostratigraphic dating. It is believed oceanic anoxic events are strongly linked to lapses in key oceanic current circulations, to climate warming and greenhouse gases.
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“A miracle, my friend, is an event which creates faith. That is the purpose and nature of miracles. They may seem very wonderful to the people who witness them, and very simple to those who perform them. That does not matter: if they confirm or create faith they are true miracles.”
—George Bernard Shaw (1856–1950)